\([(10-x).2+5]\div3-x=3\)
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[(10-x).2+5]:3-2=3
[(10-x).2+5]:3=3+2
[(10-x).2+5]:3=5
[(10-x).2+5]=5.3
(10-x).2+5=15
(10-x).2=15-5
(10-x).2=10
10-x=10:2
10-x=5
x=10-5
x=5
\(\left[\left(10-x\right).2+5\right]:3-2=3\)
\(\Rightarrow\left(10-x\right).2+5=\left(3+2\right).3\)
\(\Rightarrow\left(10-x\right).2+5=15\)
\(\Rightarrow10-x=\left(15-5\right):2\)
\(\Rightarrow10-x=5\)
\(\Rightarrow x=10-5\)
\(\Rightarrow x=5\)
Ta có: \(\left(-\dfrac{5}{8}\right)-x:3\dfrac{5}{6}+7\dfrac{3}{4}=-2\)
\(\Leftrightarrow\dfrac{-5}{8}-x:\dfrac{23}{6}+\dfrac{31}{4}+2=0\)
\(\Leftrightarrow x:\dfrac{-23}{6}+\dfrac{73}{8}=0\)
\(\Leftrightarrow x\cdot\dfrac{-6}{23}=-\dfrac{73}{8}\)
\(\Leftrightarrow x=-\dfrac{73}{8}:\dfrac{-6}{23}=\dfrac{-73}{8}\cdot\dfrac{23}{-6}\)
hay \(x=\dfrac{1679}{48}\)
Vậy: \(x=\dfrac{1679}{48}\)
\(\frac{x}{3}=\frac{10}{15}\Rightarrow x=\frac{10.3}{15}=2\)
Do ( 2 . x - 3 ) : 3 = ( 2 . x - 3 ) : 27
Nên 2 . x - 3 = 0
2 . x = 0 + 3 = 3
x = 3 : 2 = 1,5
Do 1,5 không là số nguyên nên không có GT của x thỏa mãn với đề bài.
\(\frac{x}{5}=\frac{y}{3}=\frac{z}{2}\Rightarrow\frac{x^2}{25}=\frac{y^2}{9}=\frac{z^2}{4}\)
Áp dụng tính chất dãy tỉ số bằng nhau:
\(\frac{x^2}{25}=\frac{y^2}{9}=\frac{z^2}{4}=\frac{x^2-y^2+z^2}{25-9+4}=\frac{40}{20}=2\)
Suy ra:
x = 2 x 5 = 10
y = 2 x 3 = 6
z = 2 x 2 = 4
Hồi trưa mình cx nghĩ cách giống bạn nhưng khi thay vào thì lại ko đúng
\(60\%x+0,4x+x:3=2\)
\(\Leftrightarrow\frac{3}{5}x+\frac{2}{5}x+\frac{1}{3}x=2\)
\(x\left(\frac{3}{5}+\frac{2}{5}+\frac{1}{4}\right)=2\)
\(x.\frac{4}{3}=2\)
\(x=2:\frac{4}{3}\)
\(x=\frac{3}{2}\)
a) x.(\(\dfrac{6}{7}\)+\(\dfrac{5}{6}\))=\(\dfrac{3}{4}\)
x.\(\dfrac{71}{42}\)=\(\dfrac{3}{4}\)
x=\(\dfrac{3}{4}\):\(\dfrac{71}{42}\)
x=\(\dfrac{63}{142}\)
a.\(\dfrac{6}{7}x+\dfrac{5}{6}x=\dfrac{3}{4}\)
\(x.\left(\dfrac{6}{7}+\dfrac{5}{6}\right)=\dfrac{3}{4}\)
\(x.\dfrac{71}{42}=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}:\dfrac{71}{42}\)
\(x=\dfrac{63}{142}\)
b\(\dfrac{5}{4}-\dfrac{3}{5}:x=1\dfrac{1}{3}\)
\(\dfrac{3}{5}:x=\dfrac{5}{4}-1\dfrac{1}{3}\)
\(\dfrac{3}{5}:x=\dfrac{-1}{12}\)
\(x=\dfrac{3}{5}:\dfrac{-1}{12}\)
\(x=\dfrac{-36}{5}\)
c. \(\left(\dfrac{4}{7}x-\dfrac{1}{3}\right):3\dfrac{1}{2}=0,5\)
\(\left(\dfrac{4}{7}x-\dfrac{1}{3}\right)=0,5:3\dfrac{1}{2}\)
\(\dfrac{4}{7}x-\dfrac{1}{3}=\dfrac{1}{7}\)
\(\dfrac{4}{7}x=\dfrac{1}{7}+\dfrac{1}{3}\)
\(\dfrac{4}{7}x=\dfrac{10}{21}\)
\(x=\dfrac{10}{21}:\dfrac{4}{7}\)
\(x=\dfrac{5}{6}\)
d.\(\dfrac{4}{5}-\dfrac{2}{3}x=1\dfrac{1}{4}+2,5x\)
\(\dfrac{4}{5}-\left(\dfrac{2}{3}x-2,5x\right)=1\dfrac{1}{4}\)
\(\dfrac{4}{5}-\dfrac{-11}{6}x=1\dfrac{1}{4}\)
\(\dfrac{-11}{6}x=\dfrac{4}{5}-1\dfrac{1}{4}\)
\(\dfrac{-11}{6}x=\dfrac{-9}{20}\)
\(x=\dfrac{-9}{20}:\dfrac{-11}{6}\)
\(x=\dfrac{27}{110}\)
có sai sót j xin bn thông cảm !
X x 6 + X x 1/3 = 1/2
X x ( 6 + 1/3 ) = 1/2
X x 19/3 = 1/2
X = 1/2 : 19/3
X = 3/38
MK k bt có đúng k vì k dùng máy tính nếu đúng tích mk sai thì thôi các bạn thông cảm !!
\(x\cdot6+x:3=\frac{1}{2}\)
\(x\cdot6+x\cdot\frac{1}{3}=\frac{1}{2}\)
\(x\cdot\left(6+\frac{1}{3}\right)=\frac{1}{2}\)
\(x\cdot\frac{19}{3}=\frac{1}{2}\)
\(x=\frac{1}{2}:\frac{19}{3}\)
\(x=\frac{3}{38}\)
\(\left[\left(10-x\right).2+5\right]\div3-x=3\)
\(\Rightarrow\left[20-2x+5\right]\div3-x=3\)
\(\Rightarrow25-2x=\left(3+x\right).3\)
\(\Rightarrow25-2x=9+3x\)
\(\Rightarrow25=9+5x\)
\(\Rightarrow5x=16\)
\(\Rightarrow x=3,2\)